Trimmer for sewing-machines.



No. 664,277. Patented Dec. l8, l900.

V H. A. KL EMM. v

TRIMMER FOR SEWING MACHINES.

(Application filed Apr. 27, 1900.)

(No Mqdel.)

III

\ Iii mlmu HERMANN A. KLEMM,

.ATENT FFICE' on NEW YoRKQN. Y.

TRIMMER FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 664,277, dated December 18, 1900.

Application filed April 2'7, 1900. Serial No. 14,541. (No model.)

To all whom it may concern:

Be it known that I, HERMANN A. KLEMM, a citizen of the United States of America, and a resident of New York city, county and State of New York, have invented certain new and usefullmprovementsinTrimming-OutterAttachments for Sewing-Machines, of which the following is a specification..

My invention consists of improvements in trim ming-cutter attachments for overedge and other sewing-machines, whereby it is designed to provide improved trimming apparatus, said apparatus being constructed and arranged as hereinafter described, reference being made to the accompanying drawings, in which- Figure 1 is a side view of some parts of a sewing machine, partly in elevation and partly in section, with. my improved cutter attachment applied, a part of said attachment being in section. Fig. 2 is a separate detail of the said attachment in the same view as in Fig. 1, but on a larger scale for greater clearness, and with some parts in section. Fig. 3 is a side elevation of part of the attachment detached from the machine, enlarged, as seen looking in the direction of the arrow at Fig. 2, and with a part broken out. 4 is a detail of the attachment and part of the head of the needle-bar and presser-supporting arm of the machine in section on line 2 2 of Fig. 1.

In this improved attachment both the sta tionary and movable cutters are mounted on a supporting-bracket that is detachably connected to the machine-arm, so that when the machine is to be used on work not required to be trimmed the cutters may be readily removed and the obstruction of non-detachable cutters is avoided, and when required for use the cutters may be as readily attached; but this is not broadly claimed. The bracket comprises a headpiece a, on the back of which is a dovetail-rib b, in which is a groove 0 parallel with the rib. In the side of the head (1 of the supporting-arm e is a dovetail groove f, in which the rib b of head a of the bracket is inserted for attaching the bracket to the machine. A stud-screw g is set into the arm-head d in the bottom of the groove f, and an adjusting-screw h, fitted in the end of head a of the bracket and retained by a de- Fig.

tachable pin 2', is threaded through the head of screw g for adjusting the bracket and the cutters carried by it relatively to the needle, as will more fully appear farther on.

When the attachmentis to be detached from the arm-head, pin 4; is pulled out, the

bar there is a pendent arm 1) q, supporting the stationary cutter s. The upper end of the blade of cutter 0 is bolted onto the end of an arm 25, clamped onto the stock at at u, for connecting said cutter to the stock, and below the connection with this arm is an adjusting-screwo in pendent lug w of said arm and having a shoulder as, which bears against the blade of cutter 0, so that backing the screw out will adjust said cutter closely to the stationary cutter s, and cutter 0 has a pendent finger y at its heel bearing against the side of cutter s for a guard to prevent conflict of the edges of the two cutters, said guard never rising above the edge of the lower cutter and enabling the cutter o to be sprung by screw 1;, so as to bear against the side of cutter o with sufficient tension to prevent the work from crowding it away so as to fail to out.

I am aware that in the trimming attachment of the Patent No. 644,952 there are two cutters with overlapping devices to preventinterference of the cutting edges and devices to cause sidewise pressure of the cutting edges of the cutters under tension; but in that construction the adjustable cutter is supported on the extremities of the adjusting-screws and spaced apart from the plate supporting the screws in a way not well adapted for substantial support of the cutter, while in my construction the cutter is rigidly supported by being positively clamped fast at one end to the stock by which it is carried and is not in the least dependent for its support on the screw employed for adjusting the tension.

For operating the cutter 0 a ball-headed stud is attached to stock a, between the bearing-lugs I m, by the clamp 2, with which a lever 3, pivoted at 4c on the machine-frame, engages by a socket 5 of one end embracing the ball of said stud, said lever being coupled at the end with an eccentric 6 on the main shaft 7. The clamp 2 has a guide-stud 8, projecting into a slot 9 of the bracket to preventthe cutter-stock n, which is preferably fitted in round form, from turning; but if fitted in angular form such guide-stud will not be needed. This socket and ball-stud connection of the cutter-stock and lever affords ready connection and disconnection in applying and removing the cutter attachment, and the cutters may be shifted relatively to the needle independentlyof the lever.

In Fig. l the cutter attachment is shown in relation to the needle 1.0 and the presser-foot 11, the bracket being so attached to head (I that the cutters range a little to the right of the stitch-line, with the meeting edges of the cutters about on the level of the work-plate, and so that the screw h will shift them relatively to said stitch-line, as desired, to trim closer or farther from the stitch-line.

What I claim as my invention is-- In a trimming attachment for sewing-machines in which the cutters are attached to a bracket that is detachably connected to the head of the stationary supporting-arm of the machine, the combination with the machine, of such bracket, having the head detachably attached to the machine-head, and being adjustable thereon so as to shift the cutters toward and from the needle for varying the widths of the trimmed margins of the work, and provided with means for so adjusting it; the vertical bar of said bracket having the bearing-lugs for the working-cutter stock, said stock mounted in said bearings, the working cutter attached to the lower end of said stock; pendent arm of said bracket for supporting the stationary cutter, stationary cutter mounted on said pendent arm, and means for operating said stock.

Signed by me at New York, N. Y., this 26th day of April, 1900.

HERMANN A. KLEMM.

\Vitnesses:

O. SEDGWICK, J. M. HOWARD. 

